Loops / Roll casts

Walter & Group...

On loop formation from Ally Gowans .  I included his attachment.  G. :

Hi Gordy,

 

The attached sketch may help to explain something of loop formation. The line trajectory after the rod is unloaded I think is the resultant of the combination of the line?s inertia and the force applied to the line by the rod tip before unloading (and of course external influences, drag, gravity, wind etc.).

 

Best regards,

Ally Gowans

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Pete Greenan refers to my comments on the delay of rotation relating to loop size when roll casting :

Gordy & all,

 

Looking at Ally Gowens articles and teaching methods I see the trajectory of the roll/dynamic cast to be aligned with the "rod leg", i.e. from low in the back to high in the front.  If you delay the rotation until the end of the translation you will "flatten" the trajectory to a degree that allows a tight loop directed at the target.

 

I hope I explained that so everyone can understand what I mean.  It is better described in Ally's work.

 

Pete Greenan/Florida

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Pete ...  Clear to me.  G.

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Juergen Friesenhahn provides another way of looking at the acceleration of the cast. (OH = Overhead )  G.:

Gordy,

I always teach, that there is no difference in the forwardmotion of an OH-Cast or a static/dynamic Rollcast.

 

The only difference I see personally is the way I load the rod.

 

If you have a sufficient mass behind the rod and control over the anker (short lift to move the line and Point-P), 

there is no need to power more, than in an OH-Cast. 

(This is true, as long you are not trying to do rollcasts way outside the belly.)

Loopsize is controlled by the tip path, but primarily for the "average student" done by the high stop.

I also always teach constant acceleration and late rotation.

Rodtip as long as possible behind the hand, late rotation and power.

Mathias Lilleheim allowed me to use his "visible idea" of the loadingprocess, seen here:

Z is increasing speed, A is the late rotation and P is the definite stop.

Also a "good sounding" example!  

zzzzzzzzzzzzzzzzzzzAP

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Juergen :

 

I like that !     

 

Gordy

 

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Bruce Richards comes in with a candid answer to our questions about the roll cast (CA = Casting Analyzer) :

 

Hi Gordy,

 

Because the CA picks the middle cast of about 5 false casts to analyze it is difficult to analyze roll casts. I haven't done it, but do have a thought on roll cast acceleration.

 

The best roll casts do have rather tight loops, compared to the rather big round loops many beginners throw.

 

 To get a tight loop, the rod tip must travel in a fairly straight path, during the casting stroke. Below, Mark mentions the slow hand translation that brings the rod to the right position to start the roll cast. That is not part of the casting stroke so can't be considered in the acceleration picture.

 

Just as drag in an overhead cast is not part of the casting stroke. But, once significant acceleration starts, it should be as constant as possible as that is what results in progressive rod bend and a straight(er) tip path.

 

Next time I'm out with the CA I'll try to do some roll casts. What will show is a bunch of creep that would be slow rotation to bring the rod to the proper "start" position, followed by fairly constant acceleration, assuming the cast is good.   I think.........

 

Bruce

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